NFL Media Insider Ian Rapoport previously reported Saturday that Palmer is expected to start this week against the Rams, according to a source with knowledge of Palmer's preparation. The quarterback suffered the injury early in last week's loss to the Philadelphia Eagles and played through it.

Palmer had an iffy outing against the Eagles, but had been on a steady upward climb in Arians' offense in the games prior to Week 13.

Backup quarterback Drew Stanton would have been a capable one-game replacement had Palmer not been able to play, but the Cardinals clearly wanted their starter as they hope to remain in the hunt for a wild-card berth.